Power systems on modern commercial transportation systems are moving tomore electric based equipment, thus improving the reliability of the overall system.Electrical equipment on such systems will include some loads that require very highpower for short periods of time, on the order of a few seconds, especially duringacceleration and deceleration. The current approach to solving this problem is sizing theelectrical grid for peak power, rather than the average. A method to efficiently store anddischarge the pulsed power is necessary to eliminate the cost and weight of oversizedgeneration equipment to support the pulsed power needs of these applications. HighspeedFlywheel Energy Storage Systems (FESS) are effectively capable of filling theniche of short duration, high cycle life applications where batteries and ultra capacitorsare not usable. In order to have an efficient high-speed FESS, performing threeimportant steps towards the design of the overall system are extremely vital. These stepsare modeling, analysis and control of the FESS that are thoroughly investigated in thisdissertation. This dissertation establishes a comprehensive analysis of a high-speed FESS insteady state and transient operations. To do so, an accurate model for the complete FESSis derived. State space averaging approach is used to develop DC and small-signal ACmodels of the system. These models effectively simplify analysis of the FESS and give astrong physical intuition to the complete system. In addition, they result in saving timeand money by avoiding time consuming simulations performed by expensive packages,such as Simulink, PSIM, etc.In the next step, two important factors affecting operation of the PermanentMagnet Synchronous Machine (PMSM) implemented in the high-speed FESS areinvestigated in detail and outline a proper control strategy to achieve the requiredperformance by the system. Next, a novel design algorithm developed by S.P.Bhattacharyya is used to design the control system. The algorithm has been implementedto a motor drive system, for the first time, in this work. Development of the complete setof the current- and speed-loop proportional-integral controller gains stabilizing thesystem is the result of this implementation.In the last part of the dissertation, based on the information and data achievedfrom the analysis and simulations, two parts of the FESS, inverter/rectifier and externalinductor, are designed and the former one is manufactured. To verify the validity andfeasibility of the proposed controller, several simulations and experimental results on alaboratory prototype are presented.
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